Adding an AMI Tag helper for CA configuration
This adds a CA-based helper for getting and setting the AMI tag in the tag info metadata. The output works for Derivation_tf, using the --AMITag from the runArgs.
The metadata collection from the input file isn't working yet, because the MD helper doesn't seem to access the TagInfo metadata. Suggestions there are welcome! Since this at least gets the execution metadata, not marking it a draft here... [Edit: seems to be working now!]
This attempts to address ATLASDPD-1799 , ATLASG-2433 , and a part of ATEAM-787.
For info: @jcatmore , @tadej , @khoo , and thanks to @jchapman for hand-holding.